Scanning stops, won't continue

I have an HP 6710 WinXP Pro laptop and have used ZA for about 5 years. After upgrading to the latest Extreme version, I can't get a complete scan done anymore whether a fast or full scan. After any number of files scanned - from 66 to 412, it doesn't matter, the pop up window proclaims "scan completed". The progress bar never moves and the files scanned number never increases. It simply stops dead. I have removed and clean installed twice, even tried to go back to a previous version. Nothing works.
Only other protection software in Malwarebytes and the Windows AV/AS which is shut off. Never had this problem before. I know something like a virus is running in the background because speed has dropped considerably.

Re: Scanning stops, won't continue

Originally Posted by Jersey Tom

I have an HP 6710 WinXP Pro laptop and have used ZA for about 5 years. After upgrading to the latest Extreme version, I can't get a complete scan done anymore whether a fast or full scan. After any number of files scanned - from 66 to 412, it doesn't matter, the pop up window proclaims "scan completed". The progress bar never moves and the files scanned number never increases. It simply stops dead. I have removed and clean installed twice, even tried to go back to a previous version. Nothing works.
Only other protection software in Malwarebytes and the Windows AV/AS which is shut off. Never had this problem before. I know something like a virus is running in the background because speed has dropped considerably.